Method of attaching inverted incandescent mantles to holders.



v A. SCHEIDEGGE R. METHOD OF ATTAGHING INVERTED INGANDESGENT MANTLES T0 HOLDERS. APPLICATION FILED APR. 9, 1913.

1 079 955 7 -Patented Dec. 2, 1913.

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w Attorn y ALBERT SCHEIDEGGER, OF BASEB, SWITZERLAND.

METHOD OF ATTACI-IING- INVERTED INCANDESCENT MANTLES T0 HOLDERS.

Specification of Letters Patent.

, Patented Dec. 2,1913.

Application filed April 9, 1913. Serial No. 759,909. 1"

To all whom it may concern:

Be it known that I, ALBERT a citizen of the Swiss Republic, residing at Basel, in Switzerland, have invented certain new and useful Improvements in the Method of Attaching lnvertedlncandescent Mantles to Holders, of which the following is a specification.

The method heretofore adopted for attaching inverted incandescence mantles to the annular holders with which they are fitted, consists in drawing the mantle on to a mandrel or block, which is provided with marks, and then loosely attaching an asbestos thread to the mantle above its edge or mouth, in a position indicated by that mark on the mandrel which indicates the length which the mantle is to have, the edge of the mantle being then folded back over the thread, sewn by hand and cut straight, whereupon the mantle is stripped off the mandrel and turned, and then replaced on the mandrel for the purpose of smoothing the seam. The mouth of the mantle is then drawn on to the annular holder and the thread is drawn tight in the groove of the holder, and tied, the folds produced by this operation being finely smoothed out. the holder is usually made of magnesia and is consequently fragile, it will be apparent that the process described must be carried out with great care in order to avoid injury to the holder as well as injury to the mantle.

The object of the present invention is to provide a method which is much more simple and reliable, and obviates the disadvantage of the known method.

According to the invention, the mantle turned inside out, is drawn on to a mandrel reduced in diameter at one end for a distance equal to the length which the mantle is to have, and the mantle is held on this mandrel by hand, or by means of a spring ring. The edge of the mantle, projecting beyond the shoulder of the mandrelis then folded back and the superfluous part thereof is cut off, whereupon the holder is slipped over the mantle till it abuts on the shoulder of the mandrel, and the folded edge of the mantle still projecting beyond the shoulder, is turned back over the holder and fastened thereto. As the mantle remains stretched during its attachment to; the head of the SOHEIDEGGER,

holder, the formation of folds is wholly avoided. A

- The invention is illustrated in the accompanying drawing, in which Figure 1 shows the mantle turned inside out, placed on the mandrel (first operation). Fig. 2 shows a subsequent stage of operation, the holder (shown in section) having been slipped on to the mandrel after the foldingback of the edge of the mantle (second operation). Fig. 3 shows the mantle finally secured to the holder, but still turned inside out. Fig. 4; is a sectional elevation, drawn to a larger scale illustrating the operation of attaching the-mantle to its holder.- Fig. 5 shows the mantle after it has been pulled through the holder from the position shown in Fig. 3, the mantle at this'stage being ready for reduction to ash and collodionization;

The appliance illustrated consists of a cylindrical mandrel having an upper reduced portion a, and a lower part b of larger diameter, with a shoulder a formed, at the junction of these two parts and groove d, directly below this shoulder.

The method of attaching the mantle to its holder will now be described with reference to the drawing.

In the first instance the mantleAis turned inside out and drawn onto the mandrel, at the reduced end, so that its edge is somewhat below the groove d on the thicker part Z) of the mandrel. The spring ring a is then slipped over the part a, and pushed down till it springs into thegroove d and holds the mantle securely on the mandrel. The edge of the mantle is then folded back over the spring ring, and if necessary tied, above the ring, and any superfluous material at the edge is out OK. Then the annular holder B is slipped over the part a, so that its head B rests against the'shoulder c of the mandrel, whereupon the spring ring together with the folded part of the mantle sur-- rounding it, is slippedupward on to the holder, as indicated by the arrows in Fig. 2, so that the spring snaps into the groove in the holder. By this means the mantle is firmly attached to the holder. It is then only necessary to pass the mantle Athrough the holder B as indicated by the arrow in Fig. 3.

on the holder and a large amount of injury and scrapping is avoided. The mantle may,

however, be attached without the aid of the spring ring, by holding the folded part by hand, and slipping the holder over it, the folded edge being then folded over the holder and tied thereto by means of asbestos 1 string, the manipulation is however, greatly facilitated by using the spring.

What I claim as my invention and desire to secure by Letters Patent of'the United States is: V a

'1. The method of attaching an incandescence mantle to an annular holder, which consists in drawing the mantle on to a mandrel'l'iaving a reduced end whereby a shoulder is produced, the mantle being drawn on to said reduced end and extending somewhat beyond said shoulder, slipping the annular holder over the mantle on said reduced end till said holder abuts on said shoulder, folding back, over the holder, that part of the mantle which extends beyond said shoulder, and attaching said folded back part to the holder.

2. The method of attaching an incandescence mantle to an annular holder having an external groove which consists in drawing the mantle on to a mandrel having a reduced end whereby a shoulder is produced, the mantle being drawn on to said reduced end and extending somewhat beyond said shoulder, placing a spring ring around the mantle part which projects beyond said shoulder, folding back the edge of the mantle to embrace said ring, slipping the annular holder over the mantle on said reduced end till it abuts on said shoulder, and drawing the folded part of the mantle together with the spring ring over said noluerso that the ring snaps into the groove of the holder.

In witness whereof I have signed this specification in the presence of two witnesses.

ALBERT SCHEIDEGGER.

Witnesses:

Gno. GIrroRo, ARNOLD ZUBER.

*Copies o f this patent may be obtained for five cents each, by addressing the "Commissioner of Patents, 7 Washington, D. C. 

